Preheat oven to 350 degrees. Place parchment paper/silpat on baking sheets, set aside.
Beat butter, eggs, sugar, and vanilla extract together in a large bowl until light and fluffy.
Add the cocoa powder, flour, baking soda, and salt. Beat just until well combined.
Stir in M&Ms and chocolate chips.
Using a #30 cookie scoop {one ounce} drop rounded cookies onto prepared baking sheets {9 per pan}.
Bake in preheated oven until set, but still soft and chewy, about 18 minutes.
Remove from oven and allow to cool on baking sheet for 5 to 10 minutes before moving to a wire cooling rack to cool completely.
Store in a sealed container.
Notes
If you can’t find anymore M&M’s at the store, you will still make them with white chocolate M&M’s or white chocolate chunks, and 3/4 teaspoon of peppermint extract.